Optimal Laguerre filters for sigma-delta demodulator circuits

Using orthonormal Laguerre functions a new scheme is presented for the design of optimal IIR filters which can be used in Sigma-Delta demodulator circuits. Comparing with the conventional FIR filter approach, this design offers several attractive features. The proposed IIR filter design problem is easy to solve and numerically robust. Furthermore, the optimal IIR filter is easy to implement because it needs only a small number of components and therefore, well suited to VLSI implementation over the FIR architecture. (C) 2000 Elsevier Science B.V. All rights reserved.